<template>
	<el-container>
		<el-aside width="300px" v-loading="menuloading">
			<el-container>
				<el-header>
					<el-select v-model="selectedApp">
						<el-option
							v-for="item in appList"
							:key="item.id"
							:label="item.name"
							:value="item.id"
						/>
					</el-select>
					<el-input placeholder="输入关键字过滤" v-model="menuFilterText" clearable style="margin-left: 10px;" />
				</el-header>
				<el-main class="nopadding">
					<el-tree
						ref="menu" class="menu" node-key="id" :data="menuList" :props="menuProps" draggable
						highlight-current :expand-on-click-node="false" check-strictly show-checkbox
						:filter-node-method="menuFilterNode" @node-click="menuClick" @node-drop="nodeDrop"
					>
						<template #default="{node, data}">
							<span class="custom-tree-node">
								<span class="label">
									{{ node.label }}
								</span>
								<span class="do">
									<el-button icon="el-icon-plus" size="small" @click.stop="add(node, data)" />
								</span>
						</span>
						</template>
					</el-tree>
				</el-main>
				<el-footer style="height:51px;">
					<el-button type="primary" size="small" icon="el-icon-plus" @click="add()"></el-button>
					<el-button type="danger" size="small" plain icon="el-icon-delete" @click="delMenu"></el-button>
				</el-footer>
			</el-container>
		</el-aside>
		<el-container>
			<el-main class="nopadding" style="padding:20px;" ref="main">
				<save ref="save" :menu="menuList" @refreshMenu="refreshMenu"></save>
			</el-main>
		</el-container>
	</el-container>
</template>

<script>
let newMenuIndex = 1;
import save from './save'

export default {
	name: "menus",
	components: {
		save
	},
	data() {
		return {
			menuloading: false,
			menuList: [],
			menuProps: {
				label: (data) => {
					return data.meta.title
				}
			},
			menuFilterText: "",
			appList: [],
			selectedApp: 0
		}
	},
	watch: {
		menuFilterText(val) {
			this.$refs.menu.filter(val);
		},
		selectedApp() {
			this.getMenu();
			localStorage.setItem("sys_menu_app_id", this.selectedApp);
		}
	},
	mounted() {
		this.getApp();
		this.getMenu();
	},
	methods: {

		async getApp() {
			const res = await this.$API.system.app.list.get({
				pageSize: 100
			});
			this.appList = res.data.data;

			//读取缓存 sys_menu_app_id
			const appId = localStorage.getItem("sys_menu_app_id");
			if (appId)
				this.selectedApp = Number(appId);
			else
				this.selectedApp = res.data.data[0].id;
		},

		//加载树数据
		async getMenu() {
			this.menuloading = true
			var res = await this.$API.system.menu.list.get({
				app_id: this.selectedApp
			});
			this.menuloading = false
			this.menuList = res.data;
		},
		//树点击
		menuClick(data, node) {
			var pid = node.level === 1 ? undefined : node.parent.data.id;
			this.$refs.save.setData(data, pid, this.selectedApp)
			this.$refs.main.$el.scrollTop = 0
		},
		//树过滤
		menuFilterNode(value, data) {
			if (!value) return true;
			var targetText = data.meta.title;
			return targetText.indexOf(value) !== -1;
		},
		//树拖拽
		nodeDrop(draggingNode, dropNode, dropType) {
			this.$refs.save.setData({})
			this.$message(`拖拽对象：${draggingNode.data.meta.title}, 释放对象：${dropNode.data.meta.title}, 释放对象的位置：${dropType}`)
		},
		//增加
		async add(node, data) {
			const newMenuName = "未命名" + newMenuIndex++;
			let newMenuData = {
				parentId: data ? data.id : "",
				name: newMenuName,
				path: "",
				component: "",
				meta: {
					title: newMenuName,
					type: "menu"
				},
				app_id: this.selectedApp
			}
			this.menuloading = true
			const res = await this.$API.system.menu.edit.post(newMenuData);
			this.menuloading = false
			newMenuData.id = res.data.id

			this.$refs.menu.append(newMenuData, node)
			this.$refs.menu.setCurrentKey(newMenuData.id)
			const pid = node ? node.data.id : "";
			this.$refs.save.setData(newMenuData, pid)
		},
		//删除菜单
		async delMenu() {
			const CheckedNodes = this.$refs.menu.getCheckedNodes();
			if (CheckedNodes.length === 0) {
				this.$message.warning("请选择需要删除的项")
				return false;
			}

			const confirm = await this.$confirm('确认删除已选择的菜单吗？', '提示', {
				type: 'warning',
				confirmButtonText: '删除',
				confirmButtonClass: 'el-button--danger'
			}).catch(() => {
			})
			if (confirm !== 'confirm') {
				return false
			}

			this.menuloading = true
			const reqData = {
				ids: CheckedNodes.map(item => item.id)
			};
			const res = await this.$API.system.menu.delete.post(reqData);
			this.menuloading = false

			if (res.code === 0) {
				CheckedNodes.forEach(item => {
					var node = this.$refs.menu.getNode(item)
					if (node.isCurrent) {
						this.$refs.save.setData({})
					}
					this.$refs.menu.remove(item)
				})
			} else {
				this.$message.warning(res.message)
			}
		},
		// 子组件刷新菜单
		refreshMenu() {
			this.getMenu();
		}
	}
}
</script>

<style scoped>
.menu:deep(.el-tree-node__label) {
	display: flex;
	flex: 1;
	height: 100%;
}

.custom-tree-node {
	display: flex;
	flex: 1;
	align-items: center;
	justify-content: space-between;
	font-size: 14px;
	height: 100%;
	padding-right: 24px;
}

.custom-tree-node .label {
	display: flex;
	align-items: center;
	height: 100%;
}

.custom-tree-node .label .el-tag {
	margin-left: 5px;
}

.custom-tree-node .do {
	display: none;
}

.custom-tree-node .do i {
	margin-left: 5px;
	color: #999;
}

.custom-tree-node .do i:hover {
	color: #333;
}

.custom-tree-node:hover .do {
	display: inline-block;
}
</style>
